Carpet and furniture savers!
My two cats immediately took to these for scratching and sleeping on and have not scratched my sofas or carpets since, so that is fantastic. However, they are very small and one by itself is really only kitten-sized. I have since purchased them in twos and threes and connected them edge to edge with double-sided tape, making the ultimate roomy scratcher at a fraction of the cost of the large, expensive ones. I use them on carpet, but for wood floors they may need a small rug, or blu-tac?